Which camera would be best for real estate agents: wide angle,megapixels,can be used for small/large indoor rms in whatever lighting?

A mirrorless such as a Sony A7S II with a Nikon 14-24mm lens would be "the best." But I'm not sure that a real-estate agent would want to spend nearly $4,700 just on a body/lens combo.

You already know that you need wide angle. I would suggest going with a Micro 4/3 format camera along with the widest lens that you can afford, but not a fisheye lens because it creates too much distortion. Just because a lens is wide such as Canon's 14mm, doesn't mean it's a fisheye lens. Canon's 15mm is a fisheye because it's not corrected for the various types of distortion that the 14mm is.

A Micro 4/3 camera like the Olympus OM-D EM-5 or EM-10 II, has 5-axis in-body image stabilization (IBIS). This allows you to shoot at about 4-5 stops slower shutter speeds without the need of a tripod. The benefit of IBIS, is that since the image is stabilized by moving the sensor, any lens you use will be stabilized. Pentax DSLRs also have IBIS. The time you spend having to set up & take down a tripod, plus having to lug it around makes IBIS a must-have feature.

The additional benefit of the Olympus camera is that it has a smaller Micro 4/3 sensor vs the larger APS-C. This means that you're lenses will be smaller and the focal lengths will be shorter compared to an equivalent lens in 35mm format. For example, a 50mm lens on 35mm/full-frame format has the same angle of view as a 25mm lens on any Micro 4/3 camera. The added benefit is that the shorter focal length results in an increase of depth of field (the area that's in focus). This is likely to be very beneficial to you because you will be able to get more of the room(s) in focus without having to use smaller f/stops. Using smaller f/stops will force you to either increase your ISO and/or use slower shutter speeds. This can easily result in lower image quality due to noise from too high ISO, or having to use a tripod which slows you down.

Here's a link to the EM-10 II - http://www.bhphotovideo.com/c/product/1179097-REG/...

Here's a link to the three wide-zooms that are made for the M43 format: http://www.bhphotovideo.com/c/search?atclk=Lens+Ty...

The Micro 4/3 lens mount is not proprietary, so all M43 cameras can use all M43 lenses regardless of brand.

Here's a link to photozone.de which has great lens reviews that will show you how sharp each lens is and how much distortion it creates. Distortion isn't as big of a deal as used to be. Mainly due to photo-editing software such as Photoshop or Lightroom which can remove the distortion from the images quickly and very easily.

You should consider getting Lightroom CC from Adobe. This will allow you to quickly edit your photos, and it also has a very powerful sorting/catalog system to organize your images.

DSLR with larger sensor is better because it can handle extremes of contrast better, and also lower lighting. 12-24mm (as already mentioned) or 10-20mm lens.

If the photos are only to be seen online and not in glossy brochures, then you can get away with a smaller sensor camera, so Canon G5x (onto which you can fit a flash gun) could work for you. However, clients expect to see expensive Nikon or Canon gear being used, even if they know little about it.

A modern trend is to use a cherry picker to gain height outside of the property, or even a drone with a GoPro type of camera.

http://www.bhphotovideo.com/c/product/1079158-REG/...